Handle policy refresh internally in ConfigurationPolicyPrefStore.

chrome/browser/policy/configuration_policy_provider.h

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_POLICY_CONFIGURATION_POLICY_PROVIDER_H_
 #define CHROME_BROWSER_POLICY_CONFIGURATION_POLICY_PROVIDER_H_
 #pragma once
 
 #include <string>
 #include <vector>
@@ skipping 20 matching lines @@
     };
 
     const Entry* begin;
     const Entry* end;
   };
 
   explicit ConfigurationPolicyProvider(const PolicyDefinitionList* policy_list);
 
   virtual ~ConfigurationPolicyProvider();
 
-  // Must be implemented by provider subclasses to specify the
-  // provider-specific policy decisions. The preference service
-  // invokes this |Provide| method when it needs a policy
-  // provider to specify its policy choices. In |Provide|,
-  // the |ConfigurationPolicyProvider| must make calls to the
-  // |Apply| method of |store| to apply specific policies.
-  // Returns true if the policy could be provided, otherwise false.
+  // Must be implemented by provider subclasses to specify the provider-specific
+  // policy decisions. The preference service invokes this |Provide| method when
+  // it needs a policy provider to specify its policy choices. In |Provide|, the
+  // |ConfigurationPolicyProvider| must make calls to the |Apply| method of
+  // |store| to apply specific policies. Returns true if the policy could be
+  // provided, otherwise false.
   virtual bool Provide(ConfigurationPolicyStoreInterface* store) = 0;
 
+  // Check whether this provider has completed initialization. This is used to
+  // detect whether initialization is done in case providers implementations
+  // need to do asynchronous operations for initialization.
+  virtual bool IsInitializationComplete() const { return true; }
+
   // Called by the subclass provider at any time to indicate that the currently
   // applied policy is not longer current. A policy refresh will be initiated as
   // soon as possible.
   virtual void NotifyStoreOfPolicyChange();
 
+ protected:
   // Decodes the value tree and writes the configuration to the given |store|.
   void DecodePolicyValueTree(const DictionaryValue* policies,
                              ConfigurationPolicyStoreInterface* store);
- protected:
+
   const PolicyDefinitionList* policy_definition_list() const {
     return policy_definition_list_;
   }
 
  private:
   // Contains the default mapping from policy values to the actual names.
   const ConfigurationPolicyProvider::PolicyDefinitionList*
       policy_definition_list_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ConfigurationPolicyProvider);
 };
 
 }  // namespace policy
 
 #endif  // CHROME_BROWSER_POLICY_CONFIGURATION_POLICY_PROVIDER_H_